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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d1c707c2f825ca4759105be261b6915504e51f4f579dacbb5e2b1e304d3ccd' 
  AND token = 'H0kRVZ+l3eTeNslePkBkex3NcOExS10kUpX9v1Tm76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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