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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5964687609b958222cc561bf8e64c7cfa1bc40fecf2d16e6888b6288e529f5f' 
  AND token = 'G+Ob0oSmXQ9jd9O40EtFno/5UX2keoL+hifXe9M6d84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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