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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5cea4ca8cdbc13fbc3961b4982826f19db996fce447bfacaa1b76b461fb126' 
  AND token = '4OdfJ3gDkHwIkNzf7XUbH584N5idgmJck6e8CR4D3fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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