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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701e704c992e7ba503b648b96ab3b3cd1430d806c74c0394884aae50996f7746' 
  AND token = 'kbNXJkw18beK8pujJwTf92xWPr5OI5CqDNxWv1kPazg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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