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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbbcd06786315b47d6f860e7ac8a65f413b4a3e6cdf6fc00289ddfd0b0b5b4d' 
  AND token = 'PSh2dzGf4W8l+cPTe7i4rTf6iXIe3M5loda5R/UfPLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}