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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5079efeaf218f8b111685eb00464a2ba6fa9d787a760b72f2da67ab6329415ec' 
  AND token = 'Erxaz9i/n0yHLCO3Boo3k6IlED0TozihNpwZxasR3XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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