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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035e9c46f499902831addd457dfdab78ee5ed9ea8cfed98461b052b893a73b37' 
  AND token = 'KKHJ3vW1V0EiGaEuMtJMivAseYNPqt+0tgPEAd6SLW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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