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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f44cb5819f97c69584f60962f3875bad1e21935471b55226201257ba7fd1c8' 
  AND token = 'cmQgeyKp6oX6VceqX9t9MWsgm4nrxP62QzZMRsk+2PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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