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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd582b13ccd03d2c8add2e2031568fc34d8b47135a6d1f4e8e177c06966f5fb7a' 
  AND token = 'yraXc9uy009GRli2cQVZUSk9Pm0ePoVkW8OM5IQX8U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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