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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d9ae3ea5d58927b833b8d17dcc00d29cc410de0ca3e004589a1878d651e094' 
  AND token = 'P/i2nDIRC5MyJN1Fw+cCL8I2SVFG4xy6sUuG7vO3sUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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