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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b1635aaef9fe203682a04d63fca529027d6c1044d43cb5afb0cfcd78c20d07' 
  AND token = 'xOh1+bKFvi/1jZS2HQMxpkdkJhwTl9yi6ExcII//XVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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