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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438d1a9f6fd20f5ebc70146412ee5ed5e147cea1b815514804a2fb789064512c' 
  AND token = 'dHS0XSRQshi0aGn3IDBhdRCBx+NQHhSndk4+Lsl204o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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