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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc036165a240d2bd11aadd63440e04f93249eb54348a32cbc3fb192bae7a15e0' 
  AND token = 'PmZxIKyhMoQa3JLhbpytF/0p6Bww4ZrVt8GiiVz8xKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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