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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752b4ec59b4e7a4c05e2bc180a9c076880b4b702e80333fc162c19b4b2234ecf' 
  AND token = 'd/8TcZSofpf/Ncy/ezVzujgqdvzawaKTt7jT6u6JxQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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