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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13c591088b5d015db3d35ceb719fc136343b99d93b03344ccd02762b6383e21' 
  AND token = 'jajnuHcKWLNOH/RynPAAarBF4kW+xw64/mrhkFfWkvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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