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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d76f9c7c2155109078e8510d6678aa797a3513b61ff3d3d95a58e4c60607ff0' 
  AND token = 'gtB+V4VT2fzb2AAlndsEQcQ18fBD12lah5bDmF1QVdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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