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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8465055cb71c1fb948150f4366fb6b9376b87c49c3e5a90dd835a0294650ed' 
  AND token = 'MtAYoHTxvOHI8aeBMAuMfTHVStEy0jb5jny7/M8K7xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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