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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f79abe38c5b091b9fe022c0bbf3de72f379828fae5c972b339845eb4be3dd7' 
  AND token = 'GGQbXDtl8D1JJRUZhqRE9mA9gFq1bGPXrF9squrz7DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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