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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe599e8279ee80d129e9f7995eb9bf5f7b55d4cd6c9f59c5b831f57afb73dcd' 
  AND token = 's0tUJxEeaXQkQ8HHdlMLLGPUM1+yqlv4ghHKxhUzDSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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