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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98d5f8f366fd3e601c695fabd6718a1e03c96ef5f823dfb0e8a57cc625bcdeb' 
  AND token = '0ljBhLZy+aDWrIWP/rRcGQQAttl7xYVxQEaRo/A8BzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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