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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd3567db281e24a41b6297a98f53d6effaaea5180de2c9900cb0946c4183fc7' 
  AND token = 'EhosNaqZmc0eG6kCNYyE76ES+xBXIqnP3ZawZCi6Na4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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