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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c91279fb091165ce95ff21cba928c21b8ea8a477e16a7c63ffc2e8ffa3a5c13' 
  AND token = 'gY9ql7Ff8CbFlf8VdSXV6s+ETndj1RJi1wnmvxttpF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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