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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d44a4eeaa86203d35df80c6564d4cff02c8c61b759acb8ef53761c9e3ceba5' 
  AND token = 'eWyy68Emx3eOHRcSDryQW7yJyXaML3byskFcpDK7EF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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