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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b8c2102afba7a8e3c1174ca0a9c7a6044d451feda2ef9fbf6b14abf07b700d' 
  AND token = 't7o8+hB3L2hNr43xWYJlu1fORmHqrqAC9SRPKLRjNns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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