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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11a391a6e3bef443832a1267f53a31eb36462dad9981752e7523090d3433bcb' 
  AND token = 'ZBUHyAjT4Y9PljfQcB8+e9Eqieo0lx74Uehsr3X7hw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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