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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ed106fd8500afb004b2de4cd17ff7f6324f59f10df652a7a0a6f7b3d4874ce' 
  AND token = '877I5BvV5Y97DCH9Vv2aeQOs/fCp6ruu5tgQEkeoHZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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