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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83694f039e0da354d5da3f68c63bd4187a0db6436e021c7d7b46d5f2bd411d27' 
  AND token = 'g5XA2RtYhnWjuIcyNsqaaLMatjnJo+0RlLemWE6FgnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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