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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0a9165f1bbc0322dc437ff7c1aa9af32416350903a56e0dbe2fce2e5ac1dd0' 
  AND token = 'nwKP89DeTSObD6bzetorqIwSaY0tuMhg2n0T+jdx26M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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