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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0964be81c4d2dcc3976a1850f26ad249fb875363891219294c3e5ea90ca3a9c8' 
  AND token = 'qf1Mza3HhhETtAiqNSN/+xfLQSCMae0m/099s4Gli4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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