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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c60d6de5f13d2d57470053f415cc295d27514170b83e9322d0c91918c8f03f' 
  AND token = '/8AIAquhteUCR9GptJMNjdGFJXGubU7dcmU9AEPvjX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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