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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdbadf55989e7f8a6d9c7c421ece4c247afdd7a4072a2b5b3b59154d58d1285' 
  AND token = '0q8UehqgE5AGuY0WCNyo6QFEU5zf9fupPiF+vnS2gew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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