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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8b86cc2993170c57b6e536f9b92b41cea7c5a092e958dc47f2a25a8b646b26' 
  AND token = '3jid3bV9N03VG4RooRcgBuY9xkNxUpzSssUXHcmKZGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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