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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf3662a5308c6d5f44339ff1d2da3aba75e19b4de80ef2f94419f6ad56b9f7f' 
  AND token = 'wBBEc990giQtuE7eNnNnn0xn6/C1P8MjV00SQaSrGVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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