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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682b9605a7deecdf19abb089188a5d477e59e1796ffbb27ad5e9b43894889094' 
  AND token = '7AAaoliGGj8XudFcG5QJFNCze+BS04kG07Me+Znxl2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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