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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b6f6bd2bf5a5aeb7a58cd88e682af8473dc0753cdd291e4155ef968426d351' 
  AND token = '1GdfKDUEhac84Kb04sl/SARCNG/6+aLnznfWrYExgpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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