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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62925d96df691d0e78b586f65183e0206eaed094749afc0abe129b9a33e9b80a' 
  AND token = 'YwmFqnNz0PuRt9ocqcsYP14eBrpO1EAgASLOi9shBpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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