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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b93ef8b876300afff0ae677c9974a74f60db0ac43f373b0e45e80f17a329c1' 
  AND token = 'effnsMnf2OqDAhhZ3WQcopBh6kevoIX3fjKJgWX239A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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