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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8928c03c85ca01ccb7843f651d10a7f190f72d1361723d4e3f00534a5df39da7' 
  AND token = 'FYsQ7xjLZzJc33WiHJtrw/H9cmlJ6Y8+b8PXtOiqsPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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