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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4009badd79277d9574f72828921c13ef4cbd62df8443fb8117d9b88d53dac892' 
  AND token = 'ECPnV1Mi4fLSb6rgVYLR6NW0ytFDzOamxR2qYBWi34U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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