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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bafb09f04a97fdbaee70c2b4a09a9c80afc2b415dcacdc76f138d7b6ca202e14' 
  AND token = 'nu3habVX3o1GMRmN9mMf9Cm/UBsFkR9NL/hVN7iXzPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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