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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f06124b125d4ffaed05b30a48fb446f1cbac34f57d47289855ca45d904470b' 
  AND token = 'guOTGT5vEsDBP6QEmtZiMOVKWTjnlTflizN/rXTL4ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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