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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd160e6cc26116f48ec38d1c52c13f1acdb7bff8ee44d827fc72fde57b8ac1fa0' 
  AND token = 'QcCgI01WeI2o2xNkuYetX5qxmOo0FzPisyYoM0xJIC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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