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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd276ddb7bcfcd9a68c7c72ad1ec406d18de268cc612e49894b274bafc730b7c7' 
  AND token = 'LGOgoffTDSpwUxgu6PhgC/LY9IUawUS2OdsYaiI2++A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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