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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9344dae7739e588849911868b5b4add5afb3fcd3cb0050f7e245e9c39f70f70e' 
  AND token = 'LKoRHhDZD3JAm7JL1Hl4EQkeOrGtNhevN2AEfOLuf7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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