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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f4e2db7566d97b2165f42d0117188e1791a08cbf69b3bdf46bd7db7d8f9009' 
  AND token = '1kfSKC2899wT/BnMwTnmg7uK/de+N6nkVVQstz5uEMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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