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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa10fd36f3899c2f891f90a3d0d712931bb85504b386105629661cb5e028e885' 
  AND token = 'pGhW+8ZtmhVthWtzVrkdye63dRRWkJNfaipBK0HLRow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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