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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43a7616caf3f11c5044827634446896832c3bad1f6bd621b51e31ffa9e4c468' 
  AND token = 'sfyBQhVNueEcLpyxDN+7WajemljQQnR/zCfQoP7Ou0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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