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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db2b59a2b687eea783a862384a2f2421dd442f68e3a1744fea9964621c0705b' 
  AND token = 'SQSRIMAhCgmhQ35rls0rSN5ULr9gIQZjvoHFNPnr5Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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