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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93944cf226903be9c297692b8d3ed1d0fe151ea6dda5953e605561464ceb465' 
  AND token = 'Slj7PZQvPXkZ4U1Ctop2aGQcP0NjLJVT8fib2jN4jws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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