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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712e48cd168e143372785b3be825fc3b4b26b7867349c01a15ebec692a142637' 
  AND token = 'q8lwCT1KnzqCdOPjnjoAdrJ3Vb6NzhHdMg13ZKsdFyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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