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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa8df4099063a96addadbc55b7146b96a855f2b84fb556ef7fd7b8534546b82' 
  AND token = 'zx7E3c0NCCKgYcfjN4aAi90nRzRnAP5MZfylzJSeB1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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