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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b873305b9797de6cc90a629e8fab85cdeda28814f8d278da8ad33579f2c838' 
  AND token = 'bjdHNVr+uSvKorqI6B6jjT+ohkeKnaX98c/oJT3Jepc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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