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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4ad4b0e7d9b5a353da6b146c2676b24b4c084a92f97c35b825e6905152de13' 
  AND token = '9lVLahgeKytmiemhE1AEeax2yYGhHZsp8qbxQVoLXcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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