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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d13f82a1817cfbb8658239ebe945ffdda682a77ad8e517a47e8cf5df4277d9e' 
  AND token = 'WhCRJAnrB8khvRnts0AieEhn3gYFf28RjeJumD9tWxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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