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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd3b84be2bbe0e57e4a853b2e28d5a89077ef66892152237c23dcfb332eaed3' 
  AND token = 'ydJXDdmEjmYsby7esiMem6+2ku521Egeo1QYziBp25o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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