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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f55e0670cc98f1d7962e5a0c7ea2be3ed5091edabc8ca02a8bdb833568c7ba8' 
  AND token = 'dbIvWAXO8QMvuj0gXn98GMP5VJ3/vgZDfC8gRRW/W2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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