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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cc8ddd07ef7a2e2c839cb46a892fb3609d70947cafb3b6cc2b87a69b8d60ff' 
  AND token = 'vR+QBbembj9fsm9kgZnCaeNS4EmquDxitfqr/YuEiaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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