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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdaf9b713baeea471f6cb0dbf5f334ce7e4065fc70f92230f900f9f5690726c' 
  AND token = '6iUo9UEszRebxpHofu5yn/HdNoAFkKxxYtFwnVELeJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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