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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0bbd0c4521f8a75f0bd468ea29bf6bd8ea6702d73cc760e6077aae66b0d1a2' 
  AND token = 'LoH5V58TqGfbUy876bkTIN3VI3IJDOYZB7wS/tqoWSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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