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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530945294fae02347d5a11aaf1d480aa3f4afdba7f5989c8579f0a96915a87a2' 
  AND token = 'mwHd3EWt7QZkTXhlnlmJVtFUS4fVSy9mHNE+8ORzyx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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