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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1898656648812983faaf1db13edfeef7aca6a56b41092f564af9c0929a77b9a2' 
  AND token = '9wXawuWRmAkUVMOWeFzTik+m5ejm7Z7l5cQ4zurhtMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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