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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5bccac6f8c2b195d0bba7fbec60fd7b41e378c8f741ebdd2d60f17d9328ab5' 
  AND token = 'CA/uOidToM4zfhZxOImPBdnm9wOhNrSuVmW9RYCDUs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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