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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e41f875959977fafca0055e29af4cbddab82555607666cec99d004e2092a0f8' 
  AND token = 'zq/lkDFzKSrr9JboflDP52VQ9QeL6g/R6a/Ib6ZkTio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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