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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74c3529fbd9efe9f20cb7cbc090a74d69cd78ea7ea5145ad9b2f5a633e38aa5' 
  AND token = 'SGMRAJVwnSqhuP4OHINfeC23x/PgCkqYmWOqEaSswPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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