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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ced9fbc68dda9713e3e41f9a10e75eb2a6fa6e63e67819823bab948c4ac450' 
  AND token = 'CsP3Ukxaix2BnFfKGWTRKqCU6ImVo/jvAdoEQ2LQOGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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