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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0bf4f2a58745996cd34b9f76c0681d1f8ad9eeb140b71a72e9ecb97f7300c9' 
  AND token = 'ziWZn6D028L09g6Yd313W0EzIwNr2w3n0yDQnXKGysA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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