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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b62fd90795541ad85c918066635ca8b699776184f960b4c6c733c5c6d2bc40' 
  AND token = '5WcZVMnx7yF9PQbxJlcwlb7VHSkh5VfC/sir+4PhehQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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