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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3be09fee45c8fc366d1740a67cdbe9fd0abcc9e3fe9a8b5eac1862333be2e85' 
  AND token = '0RfLUZFpmwhiWjTTyrceX99EwWqkdqj8IcwmhcwZdfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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